Help!!! I have changed the oxygen sensor several times. it works for little while before the check engine light comes back on.

 

Then I would say it's another problem. You'll need a code reader or have it read at Autozone I think you guys say do it there. Anything else happening odd or does the engine run fine? The only other problems I have had myself have been a bad thermostat= colder reading on temp guage and the dpfe sensor. Yours might be a DPFE OR EGR issue, but you'll need to get a code to confirm.

 

There are several hundred fault codes possible. Have you just been guessing why the MIL has been coming on?

 

What code is it? Im subscribed to a fix line at work that gives the leading fix for certain codes. So if I can get the code I can what the problem is.